Radiator



Aug. 1, 1933- l. T. BENNETT ET AL.

RADIATOR 2 Shets-Sheet 1 Original Filed July 12, 1928 g- 1933- T. BENNETT ET AL. 1,920,779

RADIATOR Original Filed July 12, 1928 2 Sheets-Sheet 2 fkw/wr C PEP/v04 D5.

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RADKA'EOR g T. Bennett and Frank (S. Reynolds, Brooklyn, N. Y., assignore, by mesne assignments, to American Radiator & Standard Sanitary flor poration, a Corporation oi Delaware Original application .lluly 12, 1928, Serial No.

292,309. Divided and this application Decemher 12, 1929. Serial No. 413,473

8 Glaims.

In a previous application, Serial No. 292,309 filed July 12, 1928, we have described radiators of a certain type comprising a heating element with a structure of extended area applied thereto for conducting heat to the air. Specifically, the heating element shown comprised a tube for circulating steam or other heating medium (or a cooling medium where the radiator is to be used to cool the air) and the extended area construction illustrated consisted of certain corrugated sheets, fins and flanged straps in various styles.

The present invention is a continuation in part of said previous application.

Fig. 1 is a plan and Fig. 2 a front elevation of a portion of a radiator;

Fig. 3 is a fragmentary longitudinal section on an enlarged scale;

Fig. 4 is a cross-section on the line 44 of Fig. 1;

Fig. 5 is a similar view of an alternative construction;

Fig. 6 is a plan of an alternative arrangement of the extended surface;

Fig. 7 is a section of the same on the line 7-7 of Fig. 6;

Fig. 8 is an enlarged detail section on the line 8-8 of Fig. 7;

Fig. 9 is a plan illustrating another modification in detail.

The tubes 1, generally of copper, have applied to them a sheet metal structure in units of different design and arrangement, a great variety of which are illustrated in the aforesaid pending application, to all of which the present invention is applicable.

According to Fig. 1 there are certain units each including a pair of plates 2 connected at their outer edges by a plate 3 and having flanges 4 at their inner edges. The inner edges of each unit are drawn to form semi-circular recesses 5, see Fig. '7, closely embracing the pipe. Between the two units described there are certain fins 6 in any desired number and spacing. Also enclosed within the units described are similar fins '7. The fins 2 and plates 3 provide flues which are closed horizontally and open only at the top and bottom. The fins 7 within such fiues serve to subdivide the spaces and increase the effective distribution of heat to the rising column of air. The fins 6 which are placed in the clear space between the fiues serve a similar function in distributing the heat to the air through these spaces.

The closed units comprising the plates 2 and 3 are mounted on the tube by means of straps 8, which may be of steel, which embrace the ends of said units and have portions 8 which are brought together above and below the tubing and welded together through the flanges 4 as indicated in dotted lines at 9. These straps have also flanges 10 which extend transversely and constitute fins similar to those of the groups previously described.

The manner of fastening the fins 6 is illustrated in detail in Figs. 3 and 4. Each fin has a circular fiange 11 which is fitted closely around the tube 1. Assuming the fins and their flanges to be of copper or similar soft metal, rings 12 of stiffer and heavier metal (such as steel or iron) are fitted closely around the flanges 11. These rings are of less width than the flanges. After 7 the parts are assembled as described, the rings are embraced in a contracting tool and are swaged to a slightly smaller diameter. Being narrower than the flanges 11 they bend the latter inward in a slight curve which correspondingly contracts the wall of the tube, as shown at 13. Being a rigid metal, the ring 12 holds the parts in this close position. The making of the ring of a metal having a lower co-eflicient of thermal expansion than the tube serves also this useful purpose,--when the tube is heated it expands more than the ring and thus exerts a more intimate contact with the flanges of the fins than when the parts are cool. Thus a heat conducting path of highest efliciency is secured at the time that it is wanted. The steel is not expanded beyond its limit of elasticity. When the parts are cold it will contract to its original position and will hold the fins on the tube suificiently tight.

The fins 7 are provided with flanges 14 which fit close upon the tube and may be fastened thereon as desired by expansion of the tube from within, by fastening rings similar to the rings 12, by soldering and in any one of various other ways.

the flanges 11 into the tube, a split ring may be used, such as is shown, for example, in Fig. 5. Here the plate 6 has a flange 11 surrounding the tube 1, as before. It is pressed into the tube, how- 0 ever, by means of two ring segments or straps having portions 15 embracing the flange 11 and having fiat extensions 16. When the segments are pressed together their shape is such that they force the flange 11 into the tube sufiiciently to. 1

.95 Instead of a complete ring 12 for squeezing For example, straps 8 with.

flanges 9 may be brought together and held as in Figs. 6 and 7, by means of ring sections 15, 16. In this case also the inner plates 4 of the units which form the flues are brought together between the straps 8 and the ring sections. The latter are then welded together at 1'7 as shown in Fig. 7.

Fig. 8 shows the effect on an enlarged scale. The tube 1 is bent inward slightly at 18. The ring sections 15 are, of course, shaped so as when pressed together to contract the intermediate plates 4 and 8 and form the annular depression in the tube.

The same scheme may be applied directly to the fastening of the sheet metal units described on to the tube. See Fig. 9. Here the end plates 4 of the sheet metal unit are pressed together between half rings 15, 16 and the latter welded together as above described, being shaped so small as to bend in the portions 5 and form the slight indentation in the tube 1.

In each of the cases where a split ring is illustrated a continuous ring might be substituted, and vice versa. The corrugated sheets may be in one piece throughout the length of the radiator, or in the several units and arrangements described in the foregoing pending application. Similarly the straps and the supplemental fins may be of the various designs and arrangements set forth in they foregoing pending application and also of other designs and arrangements.

What we claim is:

1. A radiator comprising a heating element and an extended area structure applied thereto comprising laterally extending fins with flanges at an edge, said flanged edges being recessed and having a heat conducting engagement with the heating element and fastening members engaging said flanges and compression them to such an extent as to form depressions in the heating element and to lock the parts together.

2. A radiator comprising a heating element and an extended area structure applied thereto comprising laterally extending fins with flanges at an edge, said flanged edges being recessed and having a heat conducting engagement with the heating element and fastening members engaging said flanges and compressing them to such an extent as to form depressions in the heating element and to lock the parts together, said fastening means being of ferrous metal and said heating element being of metal having a higher co-eflicient of thermal expansion than iron.

3. A radiator comprising a heating element and an extended area structure applied thereto comprising laterally extending flns having portions bearing against the heating element and fastening means engaging such portions and compressing them to such an extent as to form depressions in the heating element and to lock the parts together.

4. The radiator of claim 3, the heating element being a tube and the fastening means comprising a ring embracing said tube.

5. The radiator of claim 3, the heating element being a copper tube and the fastening means being a ring of steel embracing said tube.

6. A radiator comprising a tubular heating element and an extended area structure applied thereto comprising laterally extending fins with flanges at one edge surrounding said tube and fastening rings embracing said flanges and compressed thereon to form circumferential grooves in the flanges and corresponding grooves in the tubular heating element so that the flanges engage the heating element with an intimate heat conducting relation and are mechanically locked by said grooves in such relation.

7. The radiator of claim 6, the rings being of metal having a lower co-efiicient of thermal expansion than the metal of the tubular heating element.

8. The radiator of claim 5, the tubular heating element being of copper and the rings being of steel.

IRVING T. BENNE'I'I. FRANK C. REYNOLDS. 

